By means of forward (θ= 30°) Thomson scattering from TP-D plasma in He gas by CO
2 laser light, the electron density could be mesured as well as of backward scattering (θ = 171°). This scattering experiment was also carried out in Ar gas plasma and Rayleigh scattering by neutral Ar gas was measured.
Optical heterodyne method was described0 in order to detect the Doppler shift of He-Ne laser light (6328 A) scattered by liquid fluid.
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